Guide To The Stamp Game In Montessori To Foster Independent Thinking

This article provides a comprehensive guide to the Montessori Stamp Game, a vital educational tool for teaching mathematics to young learners. It explains the game’s components, its role in developing numerical understanding, and step-by-step methods for effective implementation in the classroom. The post includes practical tips for educators and parents to facilitate learning, highlighting the game’s benefits in fostering independent thinking and problem-solving skills. This guide is essential for those seeking to enhance mathematical education through Montessori methods.

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The Montessori Stamp Game is a cornerstone in early childhood education, specifically in teaching mathematics. Developed within the Montessori framework, this game ingeniously simplifies complex mathematical concepts, making them accessible and engaging for young learners.

The game’s design aligns with Maria Montessori’s hands-on learning and self-discovery philosophy. It uses tangible materials, allowing children to grasp abstract numerical concepts physically.

Stamp Game In Montessori

This guide delves into the game’s mechanics, illustrating how it assists children in understanding addition, subtraction, multiplication, and division. It also highlights the game’s role in fostering a deep, intuitive sense of numbers and mathematical operations.

The article aims to equip educators and parents with knowledge and strategies to integrate the Stamp Game into their teaching repertoire effectively. Doing so promises to enhance the learning experience, making mathematics enjoyable and intellectually stimulating for children.

What Is The Stamp Game And Why Is It Important In Montessori Education?

The Stamp Game is a fundamental tool in Montessori education, designed to teach mathematics to young children. This game utilizes a set of colored stamps, each representing a different numerical value, such as units, tens, hundreds, and thousands.

It provides a concrete way for children to engage with numbers and mathematical operations like addition, subtraction, multiplication, and division.

Its importance in Montessori education stems from its alignment with Maria Montessori’s self-directed, tactile learning principles. The game encourages children to manipulate stamps to solve mathematical problems physically, fostering a deeper understanding of abstract concepts.

This hands-on approach aids in developing a child’s cognitive skills, including problem-solving, critical thinking, and numerical comprehension.

Moreover, the Stamp Game promotes independence in learning. Children can explore mathematical concepts independently, making discoveries and correcting errors.

This instills confidence and a positive attitude toward mathematics, vital for long-term academic success. The game’s versatility also allows it to cater to various skill levels, making it a valuable resource across different stages of a child’s educational journey.

How Does The Stamp Game Align With Montessori Principles?

The Stamp Game aligns closely with Montessori principles in several key ways:

  • Hands-On Learning: True to Montessori’s emphasis on tactile experiences, the Stamp Game uses physical stamps to represent numbers. This hands-on approach allows children to ‘feel’ and manipulate mathematical concepts, transforming abstract ideas into concrete reality.
  • Self-Directed Learning: The game fosters independence. Children choose how to approach problems, explore various solutions, and self-correct their mistakes. This autonomy in learning builds self-confidence and encourages a deeper engagement with the material.
  • Individualized Pace: In Montessori education, acknowledging each child’s unique learning pace is crucial. The Stamp Game accommodates this by being adaptable to different skill levels. Children can quickly progress from simple to complex operations, ensuring a tailored learning experience.
  • Conceptual Understanding: The game moves beyond rote memorization. It helps children understand the ‘why’ behind mathematical operations. This focus on conceptual understanding aligns with Montessori’s goal of fostering genuine comprehension rather than superficial knowledge.
  • Integrated Learning: While the Stamp Game is primarily a math tool, it also enhances other cognitive skills like problem-solving, critical thinking, and fine motor skills. This holistic approach to development is a core aspect of Montessori education.
  • Joyful Learning: Montessori believed in making learning a joyful, engaging experience. With its interactive and playful elements, the Stamp Game makes learning math fun and engaging for children, aligning with this principle.

What Are The Components Of The Stamp Game?

The Stamp Game, an essential Montessori educational tool, comprises several distinct components designed to aid in teaching mathematical concepts

Stamps

Square pieces representing different numerical values. They are typically color-coded – green for units, blue for tens, red for hundreds, and green for thousands. These stamps are the primary elements used for calculations.

Number Tiles

Small tiles indicating numbers 1 to 9. They are used for labeling columns in mathematical operations and helping children organize their work.

Mathematical Symbols

Symbols for addition (+), subtraction (-), multiplication (×), and division (÷) are included. These symbols guide the child in constructing and solving different types of problems.

Skittles

These are small, peg-like pieces used primarily in division. They represent the divisor and help in distributing the stamps evenly.

Counters

Used alongside Skittles in the division, these help represent remainders.

Storage Containers

Teachers support children in understanding and managing their emotions, promoting emotional intelligence.

Work Mat

They integrate peace education into daily activities and lessons, teaching concepts of empathy, cooperation, and mutual respect.

How Is The Stamp Game Set Up In A Montessori Classroom?

The Stamp Game Set Up In A Montessori Classroom

Setting up the Stamp Game in a Montessori classroom involves a thoughtful arrangement to facilitate ease of use and learning:

  • Accessible Location: The game is placed in an easily accessible classroom area, encouraging children to use it independently.
  • Organized Storage: The stamps, tiles, symbols, skittles, and counters are neatly organized in trays or boxes. This organization aids in the quick identification of the components and fosters a sense of order, a key Montessori principle.
  • Designated Work Area: A large work mat or a designated table space is provided. Children lay out the stamps and other elements to perform mathematical operations in this area. The space is ample enough to accommodate the arrangement of stamps for more extensive calculations.
  • Instructional Materials: Clear, concise instructions or guides are available alongside the game. These materials help children understand the basic rules and procedures of the game.
  • Supplemental Resources: Additional resources like notebooks or worksheets might be provided for children to record their work and observations. This practice encourages reflection and deeper understanding.
  • Guided Introduction: Educators introduce the game initially through guided demonstrations, showing how to handle and use each component. This introduction ensures correct usage and an understanding of the game’s purpose.
  • Progressive Complexity: The game is often introduced with simpler operations like addition and subtraction, gradually progressing to more complex ones like multiplication and division as the child’s understanding deepens.

How Does The Stamp Game Enhance A Child’s Learning Experience?

The Stamp Game significantly enhances a child’s learning experience in a Montessori setting by offering several key benefits:

  • Concrete Understanding of Abstract Concepts: The game transforms abstract mathematical ideas into tangible objects using physical stamps to represent numbers. This helps children quickly grasp complex concepts like addition, subtraction, multiplication, and division.
  • Development of Cognitive Skills: The game challenges children to think critically and solve problems independently. This active engagement boosts cognitive skills such as reasoning, analysis, and logical thinking.
  • Promotion of Independent Learning: The Stamp Game is designed for children to use autonomously. This independence in learning encourages self-confidence, self-discipline, and a sense of responsibility.
  • Customizable Difficulty Levels: The game caters to various skill levels, allowing for personalized learning. Children can start with simple operations and gradually progress to more complex ones, ensuring a tailored educational experience.
  • Enhanced Concentration and Focus: Working with the game requires attention to detail and concentration. This practice helps in developing longer attention spans and better focus.
  • Improved Fine Motor Skills: Handling the small stamps and tiles aids in refining a child’s fine motor skills, which are crucial for writing and other precise movements.
  • Joyful and Engaging Learning: The game’s interactive naturegame’s interactive nature makes learning math enjoyable. Children often view the game as play, which fosters a positive attitude toward learning.
  • Foundation for Advanced Mathematical Concepts: The Stamp Game lays the groundwork for more advanced mathematical learning in future academic pursuits by building a solid understanding of basic operations.

How Do You Introduce The Stamp Game To Children?

Introducing the Stamp Game to children in a Montessori environment involves a structured and engaging approach:

  • Preliminary Activities: Begin with more straightforward Montessori materials that lay the foundation for the Stamp Game, like number rods and spindle boxes. These activities familiarize children with basic counting and number recognition.
  • Demonstration: Provide a clear, step-by-step demonstration of the game. Start with an essential operation, like addition. Show how to lay out the stamps, use the number tiles, and perform calculations.
  • Hands-On Exploration: After demonstrating, encourage children to handle the materials themselves. This hands-on exploration is crucial for their understanding and comfort with the game.
  • Guided Practice: Initially, guide the children through a few problems. Offer support and gently correct mistakes. This guidance helps them grasp the process and builds confidence.
  • Encourage Questions: Create an open atmosphere where children feel comfortable asking questions. Answering their queries helps clarify concepts and deepens their understanding.
  • Progressive Complexity: Start with simpler mathematical operations and gradually introduce more complex ones as the children become comfortable with the game.
  • Individual Pacing: Allow children to progress at their own pace. Some may grasp the concepts quickly, while others may need more time. Individual pacing is vital in Montessori education.
  • Repetition and Practice: Encourage regular practice. Repetition is crucial for mastering the skills and concepts involved in the Stamp Game.
  • Integration with Other Activities: To demonstrate its practical application, link the game with other classroom activities and real-life examples.
  • Positive Reinforcement: Provide positive feedback and encouragement. Celebrate their successes to foster a love for learning and mathematics.

What Are The Basic Steps In Playing The Stamp Game?

Playing the Stamp Game in a Montessori setting involves basic steps tailored to teach mathematical operations. Here’s a general outline for a simple operation like addition:

  • Setting Up: Arrange the stamps, number tiles, and mathematical symbols on a work mat or table. Ensure all components are organized and easily accessible.
  • Choosing a Problem: Start with a fundamental addition problem. Write it down or have it pre-prepared on a card.
  • Laying Out Stamps for First Number: Take the stamps corresponding to the first number in the problem. For instance, if the number is 243, take two hundreds (red), four tens (blue), and three units (green) and lay them out in columns.
  • Adding Stamps for Second Number: Repeat the process for the second number in the addition problem. Place these stamps in the same columns as the first set.
  • Counting and Grouping: Count the stamps in each column, starting from the units. If there are more than nine stamps in a column, group them into a higher value (e.g., ten units become one ten).
  • Exchanging Stamps: Exchange grouped stamps for the appropriate higher-value stamp. For example, exchange ten unit stamps for one ten stamp.
  • Finding the Sum: After grouping and exchanging, the remaining stamps represent the sum. Lay them out clearly to show the final answer.
  • Recording the Result: Write down the answer to reinforce the learning process.
  • Checking Work: Encourage children to verify their work by reverse calculations or using other Montessori materials.
  • Repeating with New Problems: Continue practicing with different problems, gradually increasing complexity as the child becomes more comfortable.

How Is The Stamp Game Adapted For Different Age Groups?

The Stamp Game Adapted For Different Age Groups

Adapting the Stamp Game for different age groups in a Montessori environment involves tailoring the complexity and presentation of the game to suit each age group’s developmental stage:

Younger Children (Ages 4-6)

  • Simplification: Start with basic concepts like counting and simple addition or subtraction. Use fewer stamps to avoid overwhelming them.
  • Visual Aids: Incorporate colorful materials and visual aids to make learning more engaging.
  • Concrete Examples: Use real-life examples and stories to connect mathematical concepts to their everyday experiences.
  • Guided Play: Initially, offer more guided play and demonstrations, gradually moving towards independent work as they gain confidence.

Middle Age Group (Ages 6-9)

  • Increased Complexity: Introduce more complex operations like multiplication and division. Start integrating the use of Skittles for division.
  • Problem-Solving Tasks: Encourage solving real-world problems using the Stamp Game to enhance practical understanding.
  • Collaborative Learning: Introduce activities where children can work in pairs or small groups, promoting collaborative learning and peer teaching.

Older Children (Ages 9-12)

  • Advanced Operations: Focus on more advanced mathematical operations and concepts, using the Stamp Game to aid in understanding abstract concepts like long division.
  • Link to Abstract Math: Transition from concrete stamp manipulations to more abstract mathematical thinking, preparing them for traditional mathematical learning.
  • Independent Learning: Encourage independent learning and exploration, allowing them to discover and correct their errors autonomously.
  • Critical Thinking: Pose challenging problems that require critical thinking and strategy, moving beyond straightforward calculations.

What Are Some Challenges And Solutions For Younger Children Using The Stamp Game?

Younger children, typically between the ages of 4 and 6, may face specific challenges when using the Montessori Stamp Game. Here are some common challenges and solutions to address them:

Challenge: Understanding the Concept of Place Value

  • Solution: Use concrete examples and more straightforward materials like number rods or beads to introduce the concept of units, tens, hundreds, and thousands initially. Once the basic idea is grasped, gradually transition to the Stamp Game.

Challenge: Overwhelm with Multiple Components

  • Solution: Start with a limited number of stamps and gradually introduce more as the child becomes comfortable. Keep the game simple at first, focusing on basic counting and addition.

Challenge: Difficulty in Fine Motor Skills

  • Solution: Incorporate activities that develop fine motor skills, like picking up small objects or tracking numbers. This practice will make handling the stamps easier.

Challenge: Maintaining Concentration

  • Solution: Keep sessions short and engaging. Use storytelling or relate the game to real-life scenarios that interest the child. Regular breaks can also help maintain focus.

Challenge: Making Errors in Calculation

  • Solution: Encourage self-correction by gently guiding them to recheck their work. Use other Montessori materials for cross-verification, fostering an understanding that mistakes are part of the learning process.

Challenge: Transitioning from Concrete to Abstract Thinking

  • Solution: Use visual aids and repetitive games to reinforce the connection between the physical stamps and abstract numbers. Gradually introduce more abstract concepts as their understanding deepens.

Challenge: Keeping the Materials Organized

  • Solution: Teach and reinforce the habit of organizing the stamps and other components before and after use. This instills a sense of responsibility and order.

How Can The Stamp Game Be Integrated With Other Montessori Learning Tools?

The Stamp Game Be Integrated With Other Montessori Learning Tools

Integrating the Stamp Game with other Montessori learning tools creates a holistic and enriched learning experience. Here’s how it can be effectively combined with various Montessori materials:

  • Number Rods and Bead Chains: Start with these for basic counting and understanding place value. Once children are comfortable, transition to the Stamp Game for more complex operations.
  • Golden Bead Material: Use it alongside the Stamp Game to demonstrate the same mathematical concepts with different materials. This reinforces understanding and offers a tactile experience.
  • Sandpaper Numbers: Combine these for number recognition and formation. Children can trace the numbers before using the Stamp Game to reinforce their understanding of the symbols they are working with.
  • Spindle Boxes: Use these for initial counting exercises. They help understand units, which is fundamental for using the Stamp Game.
  • Fraction Circles: To introduce concepts of division and fractions, use fraction circles along with the Stamp Game. This helps children visualize how division works and how it relates to fractions.
  • Small and Large Moveable Alphabets: Incorporate these for labeling and notation, especially for older children working on more complex mathematical problems using the Stamp Game.
  • Botany and Zoology Puzzles: Link mathematical concepts to science. For example, use the Stamp Game for counting species or leaves, integrating math with natural science learning.
  • Geometric Solids and Shapes: Use these to teach geometry concepts, applying mathematical operations learned through the Stamp Game to calculate areas or perimeters.
  • Cultural Materials: Incorporate geography and cultural studies using the Stamp Game to calculate distances, populations, or other relevant numerical data in social studies.
  • Practical Life Activities: Reinforce mathematical concepts learned through the Stamp Game in practical life activities, like cooking or gardening, where measuring and counting are involved.

What Are Examples Of Cross-Curricular Activities Involving The Stamp Game?

Cross-curricular activities involving the Stamp Game can enrich a child’s learning by connecting mathematics with other subjects. Here are some examples:

  • Math and Geography: Use the Stamp Game for calculating distances between different places on a map. This activity integrates math with geography, teaching children about spatial awareness and scale.
  • Math and Science: Incorporate the Stamp Game in science experiments that require measurement and data analysis. For instance, children can use it to calculate the growth rates of plants or quantities in simple chemical reactions, blending math with scientific observation and experimentation.
  • Math and Language Arts: Combine math problems with storytelling. Create stories where characters face problems that can be solved using math, like sharing items equally. Children can use the Stamp Game to find solutions, thus integrating math with reading and comprehension skills.
  • Math and Art: Engage children in an art project where they design patterns using stamps. They can calculate the number of stamps needed for their design, combining creativity with mathematical thinking.
  • Math and History: The Stamp Game can help children understand historical timelines. They can calculate time intervals between historical events, connecting math skills with their understanding of history.
  • Math and Music: Use the Stamp Game to teach rhythms and beats. Assign different stamp values to musical notes and use them to calculate the length of bars or entire musical pieces.
  • Math and Practical Life Skills: Involve children in cooking or baking activities where they use the Stamp Game to measure ingredients. This teaches them about proportions and quantities, applying math to everyday life.
  • Math and Physical Education: Use the Stamp Game to calculate scores or keep track of laps or distances covered in physical education activities, combining physical activity with mathematical calculation.
  • Math and Environmental Studies: Calculate quantities related to environmental conservation, like water saved by certain practices, using the Stamp Game. This integrates math with environmental awareness and conservation efforts.
  • Math and Cultural Studies: Use the Stamp Game to explore mathematical concepts in different cultures. For example, study how ancient civilizations used math and have children use the game to replicate their calculations.

How Can Educators Create Variations Of The Stamp Game For Advanced Learners?

For advanced learners, educators can create variations of the Montessori Stamp Game to present more challenging and engaging mathematical problems. Here are some ways to adapt and extend the game:

Complex Mathematical Operations

Introduce complex operations such as long division, fractions, and decimals. Use the Stamp Game to demonstrate these concepts visually, increasing the difficulty level as students’ understanding grows.

Word Problems

Create word problems that require multiple steps to solve, involving various operations. This tests their mathematical skills and enhances their reading comprehension and problem-solving abilities.

Incorporate Algebraic Concepts

Introduce introductory algebra using the Stamp Game. Represent unknowns with different colored stamps or symbols, teaching children to solve simple equations.

Speed and Accuracy Challenges

Set timed challenges for completing specific problems. This can help improve their speed and accuracy in calculations.

Peer Teaching

Encourage advanced learners to teach a concept they have mastered to their peers using the Stamp Game. Teaching others can reinforce their understanding and develop leadership skills.

Integration with Technology

Combine the Stamp Game with educational software or apps that reinforce the same mathematical concepts. This approach can offer a modern twist and appeal to tech-savvy learners.

Cross-Curricular Problems

Develop math problems that tie into other subjects like science, history, or geography, requiring students to apply their knowledge from multiple disciplines.

Real-World Application Scenarios

Create scenarios where students have to apply their math skills to solve real-world problems, like budgeting for a project, planning a garden, or calculating distances on a map.

Logical Puzzles and Brainteasers

Incorporate logical puzzles that can be solved using the Stamp Game, which encourages critical thinking and logic skills.

Advanced Mathematical Games:

Design games that require strategic thinking and advanced mathematical calculations using the stamps as part of the gameplay.

What Are Common Challenges Educators Face When Implementing The Stamp Game?

Common Challenges Educators Face When Implementing The Stamp Game

Implementing the Montessori Stamp Game can present several challenges for educators. Understanding and addressing these challenges ensures the effective use of this tool:

Different Learning Paces: Students learn at different rates, and some may struggle with concepts that others grasp quickly. Balancing this variance while ensuring each child feels supported can be challenging.

  • Solution: Personalize instruction and allow students to progress at their own pace. Provide additional support to those needing it while offering quicker learners extension activities.

Classroom Management: Managing a classroom where children are engaged in hands-on activities like the Stamp Game requires maintaining an organized, focused environment.

  • Solution: Establish clear rules and routines for using the game. Encourage self-discipline and respect for materials among students.

Ensuring Conceptual Understanding: Some children might mechanically use the stamps without fully understanding the underlying mathematical concepts.

  • Solution: Regularly check for understanding and encourage students to explain their thoughts. Use other Montessori materials to reinforce concepts.

Material Maintenance: Keeping the Stamp Game materials organized and in good condition can be challenging, especially with frequent use.

  • Solution: Teach children how to use and store the materials properly. Regularly check and maintain the components.

Integrating Technology: Balancing traditional Montessori methods with modern educational technology can be challenging for educators.

  • Solution: Use technology as a complementary tool. Digital apps, for example, can reinforce concepts learned through the Stamp Game.

Parental Involvement: Educators may find it challenging to engage parents or explain the value of the Stamp Game in their child’s education.

  • Solution: Hold workshops or send home resources to educate parents about the Montessori method and the Stamp Game’s role in learning.

Assessment: Traditional assessments might not effectively measure the skills and knowledge gained through the Stamp Game.

  • Solution: Use various assessment methods, including observations, portfolios, and practical skill demonstrations.

Adapting to Individual Needs: Some students, especially those with learning differences, might find the standard approach to the Stamp Game challenging.

  • Solution: Adapt the game to meet individual needs, possibly simplifying it or breaking down the steps further.

How Can Educators Effectively Address These Challenges?

Addressing educators’ challenges when implementing the Montessori Stamp Game requires strategic planning and adaptive teaching methods. Here are some approaches:

  • Individualized Instruction: Recognize and accommodate different learning paces. Provide one-on-one support or smaller group sessions for students who need extra help, and offer more advanced challenges for those who grasp concepts quickly.
  • Structured Environment: Establish clear, consistent rules for using the Stamp Game. Teach and reinforce the importance of respecting materials and maintaining an orderly environment. This helps in managing the classroom and keeping students focused.
  • Conceptual Reinforcement: Regularly engage students in discussions about their work with the Stamp Game to ensure deep understanding. Ask them to explain their reasoning and solutions. Use additional Montessori materials or real-life examples to reinforce concepts.
  • Regular Maintenance of Materials: Schedule regular checks and maintenance of the Stamp Game materials. Involve students in caring for and organizing the materials, instilling a sense of responsibility.
  • Integration of Technology: Balance traditional methods with technology. Use digital tools that complement the learning with the Stamp Game, such as educational apps or software for practicing math skills.
  • Engaging Parents: Educate parents about the Montessori method and the role of the Stamp Game. This can be through workshops, informational packets, or inviting parents to observe sessions. Encourage them to reinforce learning at home.
  • Diverse Assessment Strategies: Utilize various assessment methods to gauge student understanding. This could include observational notes, student reflections, portfolios, and practical demonstrations.
  • Adaptability to Student Needs: Modify the game for students with different needs. This could involve simplifying the game, using additional visual aids, or breaking down tasks into smaller, more manageable steps.
  • Professional Development: Continuously seek opportunities to stay informed about best practices in Montessori education and effective ways to use the Stamp Game.
  • Peer Learning: Encourage peer-to-peer learning where more advanced students can assist struggling students. This not only helps learners but also reinforces the concept of community learning.

Conclusion 

The Stamp Game In Montessori

Mastery of the Montessori Stamp Game lays a robust foundation for long-term mathematical understanding. It transitions children from concrete to abstract thinking, which is essential for advanced math concepts.

The game enhances problem-solving skills, fosters independent learning, and builds a positive attitude toward math.

For educators and parents, key takeaways include the importance of introducing the game progressively, adapting it to individual learning paces, and integrating it with other educational tools for a holistic approach.

Regular practice, patience, and encouraging exploration are crucial. The Stamp Game is not just a tool for learning math; it’s a stepping stone toward developing a comprehensive, analytical, and independent approach to learning.

Frequently Asked Questions 

What Age Is Appropriate For Introducing The Montessori Stamp Game?

The Montessori Stamp Game is typically introduced around ages 4-6 once children understand numbers and counting. Initially, it’s used for simple addition and subtraction, progressing to more complex operations as the child’s understanding of numbers and place value deepens.

How Does The Stamp Game Help In Understanding Complex Mathematical Operations?

The Stamp Game breaks down complex operations into visual and tactile experiences. Children can see and feel addition, subtraction, multiplication, and division processes by physically manipulating stamps to represent different numerical values.

This hands-on approach demystifies abstract concepts, making them more accessible and understandable.

Can The Stamp Game Be Used For Group Activities In A Classroom?

Absolutely. The Stamp Game can be an excellent tool for collaborative learning. Group activities can involve solving problems together, encouraging discussion, explaining thought processes, and peer learning.

They help students understand math and foster social skills and teamwork.

How Do I Keep Children Engaged With The Stamp Game?

To keep children engaged, present the game as fun and exciting. Incorporate stories or real-life scenarios into problems. Introduce new challenges regularly and encourage children to create their problems.

Linking the game to other areas of learning can also keep the experience fresh and exciting.

What Are Some Common Difficulties Children Face When Using the Stamp Game, And How Can I Address Them?

Children may need help with place value, keeping track of the different stamps, or understanding the transition from concrete stamps to abstract concepts. To address these, start with more straightforward exercises and use additional Montessori materials for reinforcement.

Ensure that children have ample practice with each step before moving on to more complex operations. Regularly check for understanding and encourage children to articulate their thought processes.

Sources:

https://reachformontessori.com/stamp-game/
https://theglobalmontessorinetwork.org/resource/elementary/stamp-game-assembly-english/
https://www.wonderfulmontessori.com/the-stamp-game
https://www.guidepostmontessori.com/stamp-game
https://www.mcssb.org/montessori-material-spotlight-the-stamp-game
http://www.infomontessori.com/mathematics/decimal-system-stamp-game.htm
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